* {
  margin: 0;
  padding: 0;
  text-decoration: none;
  font-family: "微软雅黑";
  box-sizing: border-box;
  list-style: none;
}
.header {
  width: 100%;
  height: 48px;
  background-color: #FF3333;
  text-align: center;
  line-height: 48px;
  font-size: 18px;
  color: #FFFFFF;
  position: relative;
}
.header span {
  display: block;
  width: 17px;
  height: 30px;
  background-image: url(../img/return.png);
  background-size: 100% 100%;
  position: absolute;
  top: 9px;
  left: 10px;
}
